| 1 |
- {"ast":null,"code":"import { Matrix, Quaternion, Vector3 } from \"../../Maths/math.vector.js\";\nimport { Clamp } from \"../../Maths/math.scalar.functions.js\";\nimport { Epsilon } from \"../../Maths/math.constants.js\";\n/**\n * A behavior that when attached to a mesh will follow a camera\n * @since 5.0.0\n */\nexport class FollowBehavior {\n constructor() {\n // Memory cache to avoid GC usage\n this._tmpQuaternion = new Quaternion();\n this._tmpVectors = [new Vector3(), new Vector3(), new Vector3(), new Vector3(), new Vector3(), new Vector3(), new Vector3()];\n this._tmpMatrix = new Matrix();\n this._tmpInvertView = new Matrix();\n this._tmpForward = new Vector3();\n this._tmpNodeForward = new Vector3();\n this._tmpPosition = new Vector3();\n this._workingPosition = new Vector3();\n this._workingQuaternion = new Quaternion();\n this._lastTick = -1;\n this._recenterNextUpdate = true;\n /**\n * Set to false if the node should strictly follow the camera without any interpolation time\n */\n this.interpolatePose = true;\n /**\n * Rate of interpolation of position and rotation of the attached node.\n * Higher values will give a slower interpolation.\n */\n this.lerpTime = 500;\n /**\n * If the behavior should ignore the pitch and roll of the camera.\n */\n this.ignoreCameraPitchAndRoll = false;\n /**\n * Pitch offset from camera (relative to Max Distance)\n * Is only effective if `ignoreCameraPitchAndRoll` is set to `true`.\n */\n this.pitchOffset = 15;\n /**\n * The vertical angle from the camera forward axis to the owner will not exceed this value\n */\n this.maxViewVerticalDegrees = 30;\n /**\n * The horizontal angle from the camera forward axis to the owner will not exceed this value\n */\n this.maxViewHorizontalDegrees = 30;\n /**\n * The attached node will not reorient until the angle between its forward vector and the vector to the camera is greater than this value\n */\n this.orientToCameraDeadzoneDegrees = 60;\n /**\n * Option to ignore distance clamping\n */\n this.ignoreDistanceClamp = false;\n /**\n * Option to ignore angle clamping\n */\n this.ignoreAngleClamp = false;\n /**\n * Max vertical distance between the attachedNode and camera\n */\n this.verticalMaxDistance = 0;\n /**\n * Default distance from eye to attached node, i.e. the sphere radius\n */\n this.defaultDistance = 0.8;\n /**\n * Max distance from eye to attached node, i.e. the sphere radius\n */\n this.maximumDistance = 2;\n /**\n * Min distance from eye to attached node, i.e. the sphere radius\n */\n this.minimumDistance = 0.3;\n /**\n * Ignore vertical movement and lock the Y position of the object.\n */\n this.useFixedVerticalOffset = false;\n /**\n * Fixed vertical position offset distance.\n */\n this.fixedVerticalOffset = 0;\n /**\n * Enables/disables the behavior\n * @internal\n */\n this._enabled = true;\n }\n /**\n * The camera that should be followed by this behavior\n */\n get followedCamera() {\n return this._followedCamera || this._scene.activeCamera;\n }\n set followedCamera(camera) {\n this._followedCamera = camera;\n }\n /**\n * The name of the behavior\n */\n get name() {\n return \"Follow\";\n }\n /**\n * Initializes the behavior\n */\n init() {}\n /**\n * Attaches the follow behavior\n * @param ownerNode The mesh that will be following once attached\n * @param followedCamera The camera that should be followed by the node\n */\n attach(ownerNode, followedCamera) {\n this._scene = ownerNode.getScene();\n this.attachedNode = ownerNode;\n if (followedCamera) {\n this.followedCamera = followedCamera;\n }\n this._addObservables();\n }\n /**\n * Detaches the behavior from the mesh\n */\n detach() {\n this.attachedNode = null;\n this._removeObservables();\n }\n /**\n * Recenters the attached node in front of the camera on the next update\n */\n recenter() {\n this._recenterNextUpdate = true;\n }\n _angleBetweenVectorAndPlane(vector, normal) {\n // Work on copies\n this._tmpVectors[0].copyFrom(vector);\n vector = this._tmpVectors[0];\n this._tmpVectors[1].copyFrom(normal);\n normal = this._tmpVectors[1];\n vector.normalize();\n normal.normalize();\n return Math.PI / 2 - Math.acos(Vector3.Dot(vector, normal));\n }\n _length2D(vector) {\n return Math.sqrt(vector.x * vector.x + vector.z * vector.z);\n }\n _distanceClamp(currentToTarget, moveToDefault = false) {\n let minDistance = this.minimumDistance;\n let maxDistance = this.maximumDistance;\n const defaultDistance = this.defaultDistance;\n const direction = this._tmpVectors[0];\n direction.copyFrom(currentToTarget);\n let currentDistance = direction.length();\n direction.normalizeFromLength(currentDistance);\n if (this.ignoreCameraPitchAndRoll) {\n // If we don't account for pitch offset, the casted object will float up/down as the reference\n // gets closer to it because we will still be casting in the direction of the pitched offset.\n // To fix this, only modify the XZ position of the object.\n minDistance = this._length2D(direction) * minDistance;\n maxDistance = this._length2D(direction) * maxDistance;\n const currentDistance2D = this._length2D(currentToTarget);\n direction.scaleInPlace(currentDistance / currentDistance2D);\n currentDistance = currentDistance2D;\n }\n let clampedDistance = currentDistance;\n if (moveToDefault) {\n clampedDistance = defaultDistance;\n } else {\n clampedDistance = Clamp(currentDistance, minDistance, maxDistance);\n }\n currentToTarget.copyFrom(direction).scaleInPlace(clampedDistance);\n return currentDistance !== clampedDistance;\n }\n _applyVerticalClamp(currentToTarget) {\n if (this.verticalMaxDistance !== 0) {\n currentToTarget.y = Clamp(currentToTarget.y, -this.verticalMaxDistance, this.verticalMaxDistance);\n }\n }\n _toOrientationQuatToRef(vector, quaternion) {\n Quaternion.RotationYawPitchRollToRef(Math.atan2(vector.x, vector.z), Math.atan2(vector.y, Math.sqrt(vector.z * vector.z + vector.x * vector.x)), 0, quaternion);\n }\n _applyPitchOffset(invertView) {\n const forward = this._tmpVectors[0];\n const right = this._tmpVectors[1];\n forward.copyFromFloats(0, 0, this._scene.useRightHandedSystem ? -1 : 1);\n right.copyFromFloats(1, 0, 0);\n Vector3.TransformNormalToRef(forward, invertView, forward);\n forward.y = 0;\n forward.normalize();\n Vector3.TransformNormalToRef(right, invertView, right);\n Quaternion.RotationAxisToRef(right, this.pitchOffset * Math.PI / 180, this._tmpQuaternion);\n forward.rotateByQuaternionToRef(this._tmpQuaternion, forward);\n this._toOrientationQuatToRef(forward, this._tmpQuaternion);\n this._tmpQuaternion.toRotationMatrix(this._tmpMatrix);\n // Since we already extracted position from the invert view matrix, we can\n // disregard the position part of the matrix in the copy\n invertView.copyFrom(this._tmpMatrix);\n }\n _angularClamp(invertView, currentToTarget) {\n const forward = this._tmpVectors[5];\n forward.copyFromFloats(0, 0, this._scene.useRightHandedSystem ? -1 : 1);\n const right = this._tmpVectors[6];\n right.copyFromFloats(1, 0, 0);\n // forward and right are related to camera frame of reference\n Vector3.TransformNormalToRef(forward, invertView, forward);\n Vector3.TransformNormalToRef(right, invertView, right);\n // Up is global Z\n const up = Vector3.UpReadOnly;\n const dist = currentToTarget.length();\n if (dist < Epsilon) {\n return false;\n }\n let angularClamped = false;\n const rotationQuat = this._tmpQuaternion;\n // X-axis leashing\n if (this.ignoreCameraPitchAndRoll) {\n const angle = Vector3.GetAngleBetweenVectorsOnPlane(currentToTarget, forward, right);\n Quaternion.RotationAxisToRef(right, angle, rotationQuat);\n currentToTarget.rotateByQuaternionToRef(rotationQuat, currentToTarget);\n } else {\n const angle = -Vector3.GetAngleBetweenVectorsOnPlane(currentToTarget, forward, right);\n const minMaxAngle = this.maxViewVerticalDegrees * Math.PI / 180 * 0.5;\n if (angle < -minMaxAngle) {\n Quaternion.RotationAxisToRef(right, -angle - minMaxAngle, rotationQuat);\n currentToTarget.rotateByQuaternionToRef(rotationQuat, currentToTarget);\n angularClamped = true;\n } else if (angle > minMaxAngle) {\n Quaternion.RotationAxisToRef(right, -angle + minMaxAngle, rotationQuat);\n currentToTarget.rotateByQuaternionToRef(rotationQuat, currentToTarget);\n angularClamped = true;\n }\n }\n // Y-axis leashing\n const angle = this._angleBetweenVectorAndPlane(currentToTarget, right) * (this._scene.useRightHandedSystem ? -1 : 1);\n const minMaxAngle = this.maxViewHorizontalDegrees * Math.PI / 180 * 0.5;\n if (angle < -minMaxAngle) {\n Quaternion.RotationAxisToRef(up, -angle - minMaxAngle, rotationQuat);\n currentToTarget.rotateByQuaternionToRef(rotationQuat, currentToTarget);\n angularClamped = true;\n } else if (angle > minMaxAngle) {\n Quaternion.RotationAxisToRef(up, -angle + minMaxAngle, rotationQuat);\n currentToTarget.rotateByQuaternionToRef(rotationQuat, currentToTarget);\n angularClamped = true;\n }\n return angularClamped;\n }\n _orientationClamp(currentToTarget, rotationQuaternion) {\n var _this$attachedNode;\n // Construct a rotation quat from up vector and target vector\n const toFollowed = this._tmpVectors[0];\n toFollowed.copyFrom(currentToTarget).scaleInPlace(-1).normalize();\n const up = this._tmpVectors[1];\n const right = this._tmpVectors[2];\n // We use global up vector to orient the following node (global +Y)\n up.copyFromFloats(0, 1, 0);\n // Gram-Schmidt to create an orthonormal frame\n Vector3.CrossToRef(toFollowed, up, right);\n const length = right.length();\n if (length < Epsilon) {\n return;\n }\n right.normalizeFromLength(length);\n Vector3.CrossToRef(right, toFollowed, up);\n if ((_this$attachedNode = this.attachedNode) !== null && _this$attachedNode !== void 0 && _this$attachedNode.getScene().useRightHandedSystem) {\n Quaternion.FromLookDirectionRHToRef(toFollowed, up, rotationQuaternion);\n } else {\n Quaternion.FromLookDirectionLHToRef(toFollowed, up, rotationQuaternion);\n }\n }\n _passedOrientationDeadzone(currentToTarget, forward) {\n const leashToFollow = this._tmpVectors[5];\n leashToFollow.copyFrom(currentToTarget);\n leashToFollow.normalize();\n const angle = Math.abs(Vector3.GetAngleBetweenVectorsOnPlane(forward, leashToFollow, Vector3.UpReadOnly));\n return angle * 180 / Math.PI > this.orientToCameraDeadzoneDegrees;\n }\n _updateLeashing(camera) {\n if (this.attachedNode && this._enabled) {\n const oldParent = this.attachedNode.parent;\n this.attachedNode.setParent(null);\n const worldMatrix = this.attachedNode.getWorldMatrix();\n const currentToTarget = this._workingPosition;\n const rotationQuaternion = this._workingQuaternion;\n const pivot = this.attachedNode.getPivotPoint();\n const invertView = this._tmpInvertView;\n invertView.copyFrom(camera.getViewMatrix());\n invertView.invert();\n Vector3.TransformCoordinatesToRef(pivot, worldMatrix, currentToTarget);\n const position = this._tmpPosition;\n position.copyFromFloats(0, 0, 0);\n Vector3.TransformCoordinatesToRef(position, worldMatrix, position);\n position.scaleInPlace(-1).subtractInPlace(pivot);\n currentToTarget.subtractInPlace(camera.globalPosition);\n if (this.ignoreCameraPitchAndRoll) {\n this._applyPitchOffset(invertView);\n }\n let angularClamped = false;\n const forward = this._tmpForward;\n forward.copyFromFloats(0, 0, this._scene.useRightHandedSystem ? -1 : 1);\n Vector3.TransformNormalToRef(forward, invertView, forward);\n const nodeForward = this._tmpNodeForward;\n nodeForward.copyFromFloats(0, 0, this._scene.useRightHandedSystem ? -1 : 1);\n Vector3.TransformNormalToRef(nodeForward, worldMatrix, nodeForward);\n if (this._recenterNextUpdate) {\n currentToTarget.copyFrom(forward).scaleInPlace(this.defaultDistance);\n } else {\n if (this.ignoreAngleClamp) {\n const currentDistance = currentToTarget.length();\n currentToTarget.copyFrom(forward).scaleInPlace(currentDistance);\n } else {\n angularClamped = this._angularClamp(invertView, currentToTarget);\n }\n }\n let distanceClamped = false;\n if (!this.ignoreDistanceClamp) {\n distanceClamped = this._distanceClamp(currentToTarget, angularClamped);\n this._applyVerticalClamp(currentToTarget);\n }\n if (this.useFixedVerticalOffset) {\n currentToTarget.y = position.y - camera.globalPosition.y + this.fixedVerticalOffset;\n }\n if (angularClamped || distanceClamped || this._passedOrientationDeadzone(currentToTarget, nodeForward) || this._recenterNextUpdate) {\n this._orientationClamp(currentToTarget, rotationQuaternion);\n }\n this._workingPosition.subtractInPlace(pivot);\n this._recenterNextUpdate = false;\n this.attachedNode.setParent(oldParent);\n }\n }\n _updateTransformToGoal(elapsed) {\n if (!this.attachedNode || !this.followedCamera || !this._enabled) {\n return;\n }\n if (!this.attachedNode.rotationQuaternion) {\n this.attachedNode.rotationQuaternion = Quaternion.Identity();\n }\n const oldParent = this.attachedNode.parent;\n this.attachedNode.setParent(null);\n if (!this.interpolatePose) {\n this.attachedNode.position.copyFrom(this.followedCamera.globalPosition).addInPlace(this._workingPosition);\n this.attachedNode.rotationQuaternion.copyFrom(this._workingQuaternion);\n return;\n }\n // position\n const currentDirection = new Vector3();\n currentDirection.copyFrom(this.attachedNode.position).subtractInPlace(this.followedCamera.globalPosition);\n Vector3.SmoothToRef(currentDirection, this._workingPosition, elapsed, this.lerpTime, currentDirection);\n currentDirection.addInPlace(this.followedCamera.globalPosition);\n this.attachedNode.position.copyFrom(currentDirection);\n // rotation\n const currentRotation = new Quaternion();\n currentRotation.copyFrom(this.attachedNode.rotationQuaternion);\n Quaternion.SmoothToRef(currentRotation, this._workingQuaternion, elapsed, this.lerpTime, this.attachedNode.rotationQuaternion);\n this.attachedNode.setParent(oldParent);\n }\n _addObservables() {\n this._lastTick = Date.now();\n this._onBeforeRender = this._scene.onBeforeRenderObservable.add(() => {\n if (!this.followedCamera) {\n return;\n }\n const tick = Date.now();\n this._updateLeashing(this.followedCamera);\n this._updateTransformToGoal(tick - this._lastTick);\n this._lastTick = tick;\n });\n }\n _removeObservables() {\n if (this._onBeforeRender) {\n this._scene.onBeforeRenderObservable.remove(this._onBeforeRender);\n }\n }\n}","map":{"version":3,"names":["Matrix","Quaternion","Vector3","Clamp","Epsilon","FollowBehavior","constructor","_tmpQuaternion","_tmpVectors","_tmpMatrix","_tmpInvertView","_tmpForward","_tmpNodeForward","_tmpPosition","_workingPosition","_workingQuaternion","_lastTick","_recenterNextUpdate","interpolatePose","lerpTime","ignoreCameraPitchAndRoll","pitchOffset","maxViewVerticalDegrees","maxViewHorizontalDegrees","orientToCameraDeadzoneDegrees","ignoreDistanceClamp","ignoreAngleClamp","verticalMaxDistance","defaultDistance","maximumDistance","minimumDistance","useFixedVerticalOffset","fixedVerticalOffset","_enabled","followedCamera","_followedCamera","_scene","activeCamera","camera","name","init","attach","ownerNode","getScene","attachedNode","_addObservables","detach","_removeObservables","recenter","_angleBetweenVectorAndPlane","vector","normal","copyFrom","normalize","Math","PI","acos","Dot","_length2D","sqrt","x","z","_distanceClamp","currentToTarget","moveToDefault","minDistance","maxDistance","direction","currentDistance","length","normalizeFromLength","currentDistance2D","scaleInPlace","clampedDistance","_applyVerticalClamp","y","_toOrientationQuatToRef","quaternion","RotationYawPitchRollToRef","atan2","_applyPitchOffset","invertView","forward","right","copyFromFloats","useRightHandedSystem","TransformNormalToRef","RotationAxisToRef","rotateByQuaternionToRef","toRotationMatrix","_angularClamp","up","UpReadOnly","dist","angularClamped","rotationQuat","angle","GetAngleBetweenVectorsOnPlane","minMaxAngle","_orientationClamp","rotationQuaternion","_this$attachedNode","toFollowed","CrossToRef","FromLookDirectionRHToRef","FromLookDirectionLHToRef","_passedOrientationDeadzone","leashToFollow","abs","_updateLeashing","oldParent","parent","setParent","worldMatrix","getWorldMatrix","pivot","getPivotPoint","getViewMatrix","invert","TransformCoordinatesToRef","position","subtractInPlace","globalPosition","nodeForward","distanceClamped","_updateTransformToGoal","elapsed","Identity","addInPlace","currentDirection","SmoothToRef","currentRotation","Date","now","_onBeforeRender","onBeforeRenderObservable","add","tick","remove"],"sources":["F:/workspace/202226701027/huinongbao-app/node_modules/@babylonjs/core/Behaviors/Meshes/followBehavior.js"],"sourcesContent":["import { Matrix, Quaternion, Vector3 } from \"../../Maths/math.vector.js\";\nimport { Clamp } from \"../../Maths/math.scalar.functions.js\";\nimport { Epsilon } from \"../../Maths/math.constants.js\";\n/**\n * A behavior that when attached to a mesh will follow a camera\n * @since 5.0.0\n */\nexport class FollowBehavior {\n constructor() {\n // Memory cache to avoid GC usage\n this._tmpQuaternion = new Quaternion();\n this._tmpVectors = [new Vector3(), new Vector3(), new Vector3(), new Vector3(), new Vector3(), new Vector3(), new Vector3()];\n this._tmpMatrix = new Matrix();\n this._tmpInvertView = new Matrix();\n this._tmpForward = new Vector3();\n this._tmpNodeForward = new Vector3();\n this._tmpPosition = new Vector3();\n this._workingPosition = new Vector3();\n this._workingQuaternion = new Quaternion();\n this._lastTick = -1;\n this._recenterNextUpdate = true;\n /**\n * Set to false if the node should strictly follow the camera without any interpolation time\n */\n this.interpolatePose = true;\n /**\n * Rate of interpolation of position and rotation of the attached node.\n * Higher values will give a slower interpolation.\n */\n this.lerpTime = 500;\n /**\n * If the behavior should ignore the pitch and roll of the camera.\n */\n this.ignoreCameraPitchAndRoll = false;\n /**\n * Pitch offset from camera (relative to Max Distance)\n * Is only effective if `ignoreCameraPitchAndRoll` is set to `true`.\n */\n this.pitchOffset = 15;\n /**\n * The vertical angle from the camera forward axis to the owner will not exceed this value\n */\n this.maxViewVerticalDegrees = 30;\n /**\n * The horizontal angle from the camera forward axis to the owner will not exceed this value\n */\n this.maxViewHorizontalDegrees = 30;\n /**\n * The attached node will not reorient until the angle between its forward vector and the vector to the camera is greater than this value\n */\n this.orientToCameraDeadzoneDegrees = 60;\n /**\n * Option to ignore distance clamping\n */\n this.ignoreDistanceClamp = false;\n /**\n * Option to ignore angle clamping\n */\n this.ignoreAngleClamp = false;\n /**\n * Max vertical distance between the attachedNode and camera\n */\n this.verticalMaxDistance = 0;\n /**\n * Default distance from eye to attached node, i.e. the sphere radius\n */\n this.defaultDistance = 0.8;\n /**\n * Max distance from eye to attached node, i.e. the sphere radius\n */\n this.maximumDistance = 2;\n /**\n * Min distance from eye to attached node, i.e. the sphere radius\n */\n this.minimumDistance = 0.3;\n /**\n * Ignore vertical movement and lock the Y position of the object.\n */\n this.useFixedVerticalOffset = false;\n /**\n * Fixed vertical position offset distance.\n */\n this.fixedVerticalOffset = 0;\n /**\n * Enables/disables the behavior\n * @internal\n */\n this._enabled = true;\n }\n /**\n * The camera that should be followed by this behavior\n */\n get followedCamera() {\n return this._followedCamera || this._scene.activeCamera;\n }\n set followedCamera(camera) {\n this._followedCamera = camera;\n }\n /**\n * The name of the behavior\n */\n get name() {\n return \"Follow\";\n }\n /**\n * Initializes the behavior\n */\n init() { }\n /**\n * Attaches the follow behavior\n * @param ownerNode The mesh that will be following once attached\n * @param followedCamera The camera that should be followed by the node\n */\n attach(ownerNode, followedCamera) {\n this._scene = ownerNode.getScene();\n this.attachedNode = ownerNode;\n if (followedCamera) {\n this.followedCamera = followedCamera;\n }\n this._addObservables();\n }\n /**\n * Detaches the behavior from the mesh\n */\n detach() {\n this.attachedNode = null;\n this._removeObservables();\n }\n /**\n * Recenters the attached node in front of the camera on the next update\n */\n recenter() {\n this._recenterNextUpdate = true;\n }\n _angleBetweenVectorAndPlane(vector, normal) {\n // Work on copies\n this._tmpVectors[0].copyFrom(vector);\n vector = this._tmpVectors[0];\n this._tmpVectors[1].copyFrom(normal);\n normal = this._tmpVectors[1];\n vector.normalize();\n normal.normalize();\n return Math.PI / 2 - Math.acos(Vector3.Dot(vector, normal));\n }\n _length2D(vector) {\n return Math.sqrt(vector.x * vector.x + vector.z * vector.z);\n }\n _distanceClamp(currentToTarget, moveToDefault = false) {\n let minDistance = this.minimumDistance;\n let maxDistance = this.maximumDistance;\n const defaultDistance = this.defaultDistance;\n const direction = this._tmpVectors[0];\n direction.copyFrom(currentToTarget);\n let currentDistance = direction.length();\n direction.normalizeFromLength(currentDistance);\n if (this.ignoreCameraPitchAndRoll) {\n // If we don't account for pitch offset, the casted object will float up/down as the reference\n // gets closer to it because we will still be casting in the direction of the pitched offset.\n // To fix this, only modify the XZ position of the object.\n minDistance = this._length2D(direction) * minDistance;\n maxDistance = this._length2D(direction) * maxDistance;\n const currentDistance2D = this._length2D(currentToTarget);\n direction.scaleInPlace(currentDistance / currentDistance2D);\n currentDistance = currentDistance2D;\n }\n let clampedDistance = currentDistance;\n if (moveToDefault) {\n clampedDistance = defaultDistance;\n }\n else {\n clampedDistance = Clamp(currentDistance, minDistance, maxDistance);\n }\n currentToTarget.copyFrom(direction).scaleInPlace(clampedDistance);\n return currentDistance !== clampedDistance;\n }\n _applyVerticalClamp(currentToTarget) {\n if (this.verticalMaxDistance !== 0) {\n currentToTarget.y = Clamp(currentToTarget.y, -this.verticalMaxDistance, this.verticalMaxDistance);\n }\n }\n _toOrientationQuatToRef(vector, quaternion) {\n Quaternion.RotationYawPitchRollToRef(Math.atan2(vector.x, vector.z), Math.atan2(vector.y, Math.sqrt(vector.z * vector.z + vector.x * vector.x)), 0, quaternion);\n }\n _applyPitchOffset(invertView) {\n const forward = this._tmpVectors[0];\n const right = this._tmpVectors[1];\n forward.copyFromFloats(0, 0, this._scene.useRightHandedSystem ? -1 : 1);\n right.copyFromFloats(1, 0, 0);\n Vector3.TransformNormalToRef(forward, invertView, forward);\n forward.y = 0;\n forward.normalize();\n Vector3.TransformNormalToRef(right, invertView, right);\n Quaternion.RotationAxisToRef(right, (this.pitchOffset * Math.PI) / 180, this._tmpQuaternion);\n forward.rotateByQuaternionToRef(this._tmpQuaternion, forward);\n this._toOrientationQuatToRef(forward, this._tmpQuaternion);\n this._tmpQuaternion.toRotationMatrix(this._tmpMatrix);\n // Since we already extracted position from the invert view matrix, we can\n // disregard the position part of the matrix in the copy\n invertView.copyFrom(this._tmpMatrix);\n }\n _angularClamp(invertView, currentToTarget) {\n const forward = this._tmpVectors[5];\n forward.copyFromFloats(0, 0, this._scene.useRightHandedSystem ? -1 : 1);\n const right = this._tmpVectors[6];\n right.copyFromFloats(1, 0, 0);\n // forward and right are related to camera frame of reference\n Vector3.TransformNormalToRef(forward, invertView, forward);\n Vector3.TransformNormalToRef(right, invertView, right);\n // Up is global Z\n const up = Vector3.UpReadOnly;\n const dist = currentToTarget.length();\n if (dist < Epsilon) {\n return false;\n }\n let angularClamped = false;\n const rotationQuat = this._tmpQuaternion;\n // X-axis leashing\n if (this.ignoreCameraPitchAndRoll) {\n const angle = Vector3.GetAngleBetweenVectorsOnPlane(currentToTarget, forward, right);\n Quaternion.RotationAxisToRef(right, angle, rotationQuat);\n currentToTarget.rotateByQuaternionToRef(rotationQuat, currentToTarget);\n }\n else {\n const angle = -Vector3.GetAngleBetweenVectorsOnPlane(currentToTarget, forward, right);\n const minMaxAngle = ((this.maxViewVerticalDegrees * Math.PI) / 180) * 0.5;\n if (angle < -minMaxAngle) {\n Quaternion.RotationAxisToRef(right, -angle - minMaxAngle, rotationQuat);\n currentToTarget.rotateByQuaternionToRef(rotationQuat, currentToTarget);\n angularClamped = true;\n }\n else if (angle > minMaxAngle) {\n Quaternion.RotationAxisToRef(right, -angle + minMaxAngle, rotationQuat);\n currentToTarget.rotateByQuaternionToRef(rotationQuat, currentToTarget);\n angularClamped = true;\n }\n }\n // Y-axis leashing\n const angle = this._angleBetweenVectorAndPlane(currentToTarget, right) * (this._scene.useRightHandedSystem ? -1 : 1);\n const minMaxAngle = ((this.maxViewHorizontalDegrees * Math.PI) / 180) * 0.5;\n if (angle < -minMaxAngle) {\n Quaternion.RotationAxisToRef(up, -angle - minMaxAngle, rotationQuat);\n currentToTarget.rotateByQuaternionToRef(rotationQuat, currentToTarget);\n angularClamped = true;\n }\n else if (angle > minMaxAngle) {\n Quaternion.RotationAxisToRef(up, -angle + minMaxAngle, rotationQuat);\n currentToTarget.rotateByQuaternionToRef(rotationQuat, currentToTarget);\n angularClamped = true;\n }\n return angularClamped;\n }\n _orientationClamp(currentToTarget, rotationQuaternion) {\n // Construct a rotation quat from up vector and target vector\n const toFollowed = this._tmpVectors[0];\n toFollowed.copyFrom(currentToTarget).scaleInPlace(-1).normalize();\n const up = this._tmpVectors[1];\n const right = this._tmpVectors[2];\n // We use global up vector to orient the following node (global +Y)\n up.copyFromFloats(0, 1, 0);\n // Gram-Schmidt to create an orthonormal frame\n Vector3.CrossToRef(toFollowed, up, right);\n const length = right.length();\n if (length < Epsilon) {\n return;\n }\n right.normalizeFromLength(length);\n Vector3.CrossToRef(right, toFollowed, up);\n if (this.attachedNode?.getScene().useRightHandedSystem) {\n Quaternion.FromLookDirectionRHToRef(toFollowed, up, rotationQuaternion);\n }\n else {\n Quaternion.FromLookDirectionLHToRef(toFollowed, up, rotationQuaternion);\n }\n }\n _passedOrientationDeadzone(currentToTarget, forward) {\n const leashToFollow = this._tmpVectors[5];\n leashToFollow.copyFrom(currentToTarget);\n leashToFollow.normalize();\n const angle = Math.abs(Vector3.GetAngleBetweenVectorsOnPlane(forward, leashToFollow, Vector3.UpReadOnly));\n return (angle * 180) / Math.PI > this.orientToCameraDeadzoneDegrees;\n }\n _updateLeashing(camera) {\n if (this.attachedNode && this._enabled) {\n const oldParent = this.attachedNode.parent;\n this.attachedNode.setParent(null);\n const worldMatrix = this.attachedNode.getWorldMatrix();\n const currentToTarget = this._workingPosition;\n const rotationQuaternion = this._workingQuaternion;\n const pivot = this.attachedNode.getPivotPoint();\n const invertView = this._tmpInvertView;\n invertView.copyFrom(camera.getViewMatrix());\n invertView.invert();\n Vector3.TransformCoordinatesToRef(pivot, worldMatrix, currentToTarget);\n const position = this._tmpPosition;\n position.copyFromFloats(0, 0, 0);\n Vector3.TransformCoordinatesToRef(position, worldMatrix, position);\n position.scaleInPlace(-1).subtractInPlace(pivot);\n currentToTarget.subtractInPlace(camera.globalPosition);\n if (this.ignoreCameraPitchAndRoll) {\n this._applyPitchOffset(invertView);\n }\n let angularClamped = false;\n const forward = this._tmpForward;\n forward.copyFromFloats(0, 0, this._scene.useRightHandedSystem ? -1 : 1);\n Vector3.TransformNormalToRef(forward, invertView, forward);\n const nodeForward = this._tmpNodeForward;\n nodeForward.copyFromFloats(0, 0, this._scene.useRightHandedSystem ? -1 : 1);\n Vector3.TransformNormalToRef(nodeForward, worldMatrix, nodeForward);\n if (this._recenterNextUpdate) {\n currentToTarget.copyFrom(forward).scaleInPlace(this.defaultDistance);\n }\n else {\n if (this.ignoreAngleClamp) {\n const currentDistance = currentToTarget.length();\n currentToTarget.copyFrom(forward).scaleInPlace(currentDistance);\n }\n else {\n angularClamped = this._angularClamp(invertView, currentToTarget);\n }\n }\n let distanceClamped = false;\n if (!this.ignoreDistanceClamp) {\n distanceClamped = this._distanceClamp(currentToTarget, angularClamped);\n this._applyVerticalClamp(currentToTarget);\n }\n if (this.useFixedVerticalOffset) {\n currentToTarget.y = position.y - camera.globalPosition.y + this.fixedVerticalOffset;\n }\n if (angularClamped || distanceClamped || this._passedOrientationDeadzone(currentToTarget, nodeForward) || this._recenterNextUpdate) {\n this._orientationClamp(currentToTarget, rotationQuaternion);\n }\n this._workingPosition.subtractInPlace(pivot);\n this._recenterNextUpdate = false;\n this.attachedNode.setParent(oldParent);\n }\n }\n _updateTransformToGoal(elapsed) {\n if (!this.attachedNode || !this.followedCamera || !this._enabled) {\n return;\n }\n if (!this.attachedNode.rotationQuaternion) {\n this.attachedNode.rotationQuaternion = Quaternion.Identity();\n }\n const oldParent = this.attachedNode.parent;\n this.attachedNode.setParent(null);\n if (!this.interpolatePose) {\n this.attachedNode.position.copyFrom(this.followedCamera.globalPosition).addInPlace(this._workingPosition);\n this.attachedNode.rotationQuaternion.copyFrom(this._workingQuaternion);\n return;\n }\n // position\n const currentDirection = new Vector3();\n currentDirection.copyFrom(this.attachedNode.position).subtractInPlace(this.followedCamera.globalPosition);\n Vector3.SmoothToRef(currentDirection, this._workingPosition, elapsed, this.lerpTime, currentDirection);\n currentDirection.addInPlace(this.followedCamera.globalPosition);\n this.attachedNode.position.copyFrom(currentDirection);\n // rotation\n const currentRotation = new Quaternion();\n currentRotation.copyFrom(this.attachedNode.rotationQuaternion);\n Quaternion.SmoothToRef(currentRotation, this._workingQuaternion, elapsed, this.lerpTime, this.attachedNode.rotationQuaternion);\n this.attachedNode.setParent(oldParent);\n }\n _addObservables() {\n this._lastTick = Date.now();\n this._onBeforeRender = 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